Pulverizer



1. C. TARVIN.

PULVERIZER.

APPLICATION FILED JUNE 13, I919.

Patented Nov 15, 1921.

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JOHN C. TARVIN, OF MARYVILLE, TENNESSEE; MARY C. TARVIN ADMINISTRATRIX OF SAID JOHN G. 'JLAEVIN, DECEASED.

PULVERIZER.

Application filed June 13, 1919.

To all u: 7mm it may concern:

Be it known that I, JOHN C. TARVIN, a citizen of the United States, residing at Maryville, in the county of Blount and State of Tennessee, have invented a new and useful Improvement in Pulverizers, of which the following is a specification, reference bein had to the accompanying drawing.

TVly improvement relates to such pulverizing machines as have heretofore been used for reducing stone, ore, slag, glass, coal, coke, bark, seeds and other dry substances to smaller sizes. The invention relatesparticularly to such machines of the above-mentioned general .class as embody hammers hinged to a rotary structure, the rotary structure subjecting thehammers to centrifugal action, whereby the hammers bear outward toward or against a stationary wall which is approximately concentric to the axis of the rotary body.

The object of my improvement is to produce such hammers in a form adapted to greater efficiency and durability.

In the accompanying drawings,

Figure 1 is a section along the axis of a machine embodying my improved hammers;

Fig. 2 is an upright section on the line, 22, of Fig. 1, looking toward the left;

Figs. 3, 4E, and 5 are, respectively, side, end and top views of one of the hammers;

Fig. 6 is a section on the line, 66, of Fig. 3;

Fig. 7-?, of Fig. 5;

Fig. 8 is a cross section on the line, 88, of Figs. 3 and 5;v 1

Figs. 9 and 10 illustrate modifications of the hammer.

Referring to said drawings, A is the axle of the rotary structure. Thisrests in horizontal bearings, B, formed on the upright side walls, 0. Between theside walls the axle bears two hubs, D. To said hubs are applied three centrifugal hammers, F. On each end of each hammer is an arm, F which extends toward the axle, A, and overlaps one of the faces of the adjacent hub, D. A. hinge rod, E, extends loosely through the two arms of the same hammer and has its 7.is a section on the line,

ends seated .in the hubs, D.

Thus the hammer is free to turn on said rod and also to be carried in an orbital path around the axis of the rotary structure which comprises .the axle, A, the hubs, .D,

Specification of Letters Eatent.

Patented Nev. raiser.

Serial No. 303,955.

the three hinged hammers, and the three hinge rods.

The hammers work in opposition to stationary walls which are outside of and approximately concentric to the path of the hammers. Such walls are known'to this art and form no part of this invention.

Theparts of the structure thus far described have been heretofore used. The particular form of the hammers, to which my invention relates, will now be described.

In cross section, the body of each hammer presents the general form of a rectangular parallelogram, such being gradually increased in thickness from each end of said body to its middle, in order that the middle of the body may have additional thickness which may be considerably reduced by wear without rendering the hammer unfit for further service. This feature is made desirable by the fact that the greater part of impact upon the hammer is "made along the middle of the hammer.

Channels, F are formed in the side and top faces of the hammer body. Thereby ribs, F are formed. Said channels on each face are extended inward to a common plane. Thereby the channels gradually increase in depth going from the ends to the middle of thebody. Thereby the ribs, F, increase in dimension perpendicular to the face of the hammer progressively from the ends to the middle of the body. Thereby the ribs are made larger on the portion of the hammer which is to receive the larger wear. This allows for a substantial amount of reduction of the ribs by wear before said ribs are so much reduced as to be made unfit for further operation. By placing grooves onboth side faces, whereby each side face is adapted to be used as a working or impact face-a face which makes impact with the material reduced, the hammer is made reversible; so that when the hammer is first placed on a rotary structure, either side may be directed forward and the ham mer used in that position until the forward side has been so much reduced by wear as to require change. Then the hammer is to be reversed. When that has been done, the hammer presents an entirely new working or impact face.

' middle of the body.

In Fig. 9'tl1e channels are transverse to the hammer body and parallel to a planeto' which the. hammer body is perpendicular. In Fig. 10 the channels are straight and oblique to the length of the hammer.

The purpose of the oblique channels is to reduce the tendency of the hammer to pass reduced or partially reduced material without moving it, the ribs adaptingthehammer to give a sweeping action along the entire length of either face of the hammer.

By'slanting the channels from, the middle longitudinal line of the hammer-faces toward the middle ofthe length of the hammer, the ribs tend to move material toward the middle of the hammer, as is desirable. In this connection, it is to be observed that this action will overcome tendency, if any there be, toward movement of material away from the middle of the length of the hammer on account of the enlarged cross section of the hammer at the middle of its length. 7 r 7 Furthermore, by making the channels oblique, the aggregate length of the. outer edges of the ribsis increased; This is important, because the working of the apparatus is dependent largely upon impact between the edges of the ribs and the material which is to be reduced.

And it is to be noted that this greater length of the ribs reduces the wear on any given part'of the ribs. Hence the'edgesof the ribs will have a longer period of service.

Furthermore, by making these ribs oblique, their edges are adapted to make oblique or shaving cuts when they make contact with the material which is to be reduced.

I'claim as my invention,

V 1. In a pulverizing machine of the, nature described, the combination with a rotary body, of a hammer hinged on a line parallel to and outside of the axisof said body and saidhammer having a body parallel to said axisand said hammer body having a transversely-ribbed working or impact face at eachside and 'onits top, said ribs-forming cutting edges, substantially as described;

2. Ina pulverizing machine of the nature described, thecombination .with, a; rotary body, of a hammer hinged ona line parallel to andoutside of; the axis of said bodyandsaid hammer having a body parallel tosaidaxis and strips or zones of said hammer, body being channeled; transversely tothe length of the rotary body, thereby forming, transverse ribs havingcutting edges lying in. theface .ot the body, substantially as described.

3. In a, pulverizing machineofthenature described, the combination with; a; rotary body, of a. hammenhinged ona line parallel to, and outside-of the axis of; said body and described, the combination with a rotary body, ofa hammerhinged on a line parallel to and outside ofthe axis of said body and said hammer having a body parallel to said axis and said body being transversely and on opposite sides channeled, thereby forming ribs located on said sides and forming cutting edges, substantially asdescribed.

In a pulverizingmachine of the nature described, the combination with a rotary body, of a hammer hinged on a line parallel to and outside of the axis of said body and said hammer having a body parallel to said axis and said hammer body being channeled transversely to its length at each side andon its top,thereby forming ribs having. cutting edges, substantially as described.

6, In a pulverizing machine of thenature described, the combination with a rotary body, of a hammer hinged on a line parallel to and outside of the axis of said body and said hammerhaving a body parallel to said axis and said hammer body being obliquely channeled to form oblique ribs,.s ibsta tially as described.

7. A mill hammer consisting, of a body having end supporting arms rigidaonand,

integral with the body and providedwith openings therein, said body being provided with oppositely disposed ribs on both its sides and its outer face, substantially as described. i

8. In a pulverizing machine of thenature described, the combination with" a rotary body, ofa hammer hinged on a line parallel to and outside of the axis of said body and said hammer having a body parallelfto said axis and said hammer bodybeing channeled obliquely and to varying, depths to form oblique ribs of varying dimensions, substantially as described. V i

9. In a pulverizing machme of the ,nature described, the combination-with a" rotary body, of a hammer, hinged on a line parallel to and outside of the axisuof said body and,

said hammer havinga ,body parallelto said axis and theface of said body'fbeingchanneled obliquely to form ribs. presenting edges for shearing cutting and presenting faces for crushing by. impact with, the, material to] be pulverized, substantially .asjd'escribed. V V V '.TY,

10. In a pulverizing machine of the nature described, the combination .with' a. rotary body, of a hammerhinged: on aline parallel to and outside of the axisof said; body and said hammer having a body parallel to said axis and the face of said body being chan neled obliquely to form ribs presenting edges for shearing cutting and presenting faces for crushing by impact with the material to be pulverized, the channels being of increasing depth from the ends of the hammer body toward the'middle of said body, substantially as described.

11. In a pulverizing machine of the nature described, the combination with a rotary body, of a hammer hinged on a line parallel to and outside of the axis of said body and said hammer having a body parallel to said axis, and the top face of the hammer being extended outward from its ends toward the middle, and said face of the hammer being transversely channeled to a line which is parallel to said axis, whereby the channels are made of different depths and the ribs of the head and said ribs have cutting edges,

and the middle of the hammer is adapted to take greater wear, substantially as described. 12. In a pulverizing machine of the nature described, the combination with a rotary body, of a hammer hinged on a line parallel to and outside of the axis of said body and said hammer having a body parallel to said axis, and the top and side faces of said body being extended outward from the ends of the body toward the middle, and said faces being channeled to equal distances from the axis of said body, whereby channels of depths and ribs of height increasing from the ends of the head toward its middle are name this 31st day of May, in the yearone thousand nine hundred and nineteen.

JOHN C. TARVIN. 

